by 699999999 January 23, 2023

by Dinglechalk2 October 10, 2022

by Ner0.D0ntia September 11, 2021

by eunmi007 July 13, 2006

by Number me January 22, 2023

by MickeysTrapHouse June 21, 2019

The 2.5 km. (1.5 mile) Forth Railway Bridge, the worldâs first major steel bridge, with its gigantic girder spans of 521 m. (1710 ft.) ranks as one of the great feats of civilization. It was begun in 1883 and formally completed on 4 March 1890 when HRH Edward Prince of Wales tapped into place a âgoldenâ rivet.
TancredâArrol, constructed the bridge, robustly designed in the aftermath of the Tay Bridge disaster by civil engineers Sir John Fowler and Benjamin Baker. The balanced cantilever principle was adopted. The main crossing comprises tubular struts and lattice-girder ties in three double-cantilevers each connected by 105 m. (345 ft.) âsuspendedâ girder spans resting on the cantilever ends and secured by man-sized pins. The outside double-cantilever shoreward ends carry weights of about 1000 tonnes to counter-balance half the weight of the suspended span and live load.
This concept is readily understood from Bakerâs âhuman cantileverâ model with his assistant Kaichi Watanabe representing the live load. The pull in his supporters arms indicates the tension in the ties and the push in the lower struts the compression in the tubes.
Each of the 110 m. (361 ft.) high double-cantilevers is supported on well-founded granite faced piers. The bridgeâs construction involved the employment of 4,000 men at times, the use of 54,000 tonnes of steel and driving 6,500,000 rivets. Its total cost was ÂŁ3,200,000 (~ÂŁ235,000,000 today).
TancredâArrol, constructed the bridge, robustly designed in the aftermath of the Tay Bridge disaster by civil engineers Sir John Fowler and Benjamin Baker. The balanced cantilever principle was adopted. The main crossing comprises tubular struts and lattice-girder ties in three double-cantilevers each connected by 105 m. (345 ft.) âsuspendedâ girder spans resting on the cantilever ends and secured by man-sized pins. The outside double-cantilever shoreward ends carry weights of about 1000 tonnes to counter-balance half the weight of the suspended span and live load.
This concept is readily understood from Bakerâs âhuman cantileverâ model with his assistant Kaichi Watanabe representing the live load. The pull in his supporters arms indicates the tension in the ties and the push in the lower struts the compression in the tubes.
Each of the 110 m. (361 ft.) high double-cantilevers is supported on well-founded granite faced piers. The bridgeâs construction involved the employment of 4,000 men at times, the use of 54,000 tonnes of steel and driving 6,500,000 rivets. Its total cost was ÂŁ3,200,000 (~ÂŁ235,000,000 today).
by AndersOon1992 August 10, 2012
